vital function

noun Physiology.
any function of the body that is essential for life.

Origin:
1795–1805

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Extrapolation is not an exercise in ignorance it is a vital function of the scientific imagination.
However, it would be a mistake to rely on one version of the language to perform this vital function.
The same social problem destroyed equally vital function of science.
The liver is one of the largest organs of the body and serves the vital function of filtering all the circulating blood.
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